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link: Set machine and float ABI when invoking ld.lld and lld-link.

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If this isn't done, LTO can completely miscompile the input bitcode modules for
certain targets where we need to explicitly set these ABIs (because LLVM's
defaults are bad).
This commit is contained in:
Alex Rønne Petersen 2024-12-16 06:07:02 +01:00
parent cd8c92fc40
commit afe2fed34d
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2 changed files with 19 additions and 0 deletions
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7
src/link/Coff.zig
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@ -1876,6 +1876,13 @@ fn linkWithLLD(coff: *Coff, arena: Allocator, tid: Zcu.PerThread.Id, prog_node:
if (comp.version) |version| {
try argv.append(try allocPrint(arena, "-VERSION:{}.{}", .{ version.major, version.minor }));
}
if (target_util.llvmMachineAbi(target)) |mabi| {
try argv.append(try allocPrint(arena, "-MLLVM:-target-abi={s}", .{mabi}));
}
try argv.append(try allocPrint(arena, "-MLLVM:-float-abi={s}", .{if (target.abi.floatAbi() == .hard) "hard" else "soft"}));
if (comp.config.lto != .none) {
switch (optimize_mode) {
.Debug => {},

12
src/link/Elf.zig
View File

@ -1700,6 +1700,18 @@ fn linkWithLLD(self: *Elf, arena: Allocator, tid: Zcu.PerThread.Id, prog_node: s
try argv.append(try std.fmt.allocPrint(arena, "--sysroot={s}", .{sysroot}));
}
if (target_util.llvmMachineAbi(target)) |mabi| {
try argv.appendSlice(&.{
"-mllvm",
try std.fmt.allocPrint(arena, "-target-abi={s}", .{mabi}),
});
}
try argv.appendSlice(&.{
"-mllvm",
try std.fmt.allocPrint(arena, "-float-abi={s}", .{if (target.abi.floatAbi() == .hard) "hard" else "soft"}),
});
if (comp.config.lto != .none) {
switch (comp.root_mod.optimize_mode) {
.Debug => {},